STEVAL-LNBH01
Power supply evaluation board for LNB based on the LNBH25LS
Data brief
Description
This evaluation board implements a DC-DC
converter based on the LNBH25LS device. It is
used to power LNBs inside dish antennas to
receive satellite TV signals.
The LNBH25LS is an integrated solution for
supplying / interfacing satellite LNB modules in
accordance with international standards. This
simple solution offers a complete solution for dual
tuner satellite receivers and offers high
performance at low cost with a low external
component count.
Features
Complete interface between LNB and I²C
bus
Built-in DC-DC converter for single 12 V
supply operation and high efficiency (typ.
93% at 0.5 A)
Selectable output current limit by external
resistor
Compliant with output voltage specifications
for principal satellite receivers (15
programmable levels)
Accurate built-in 22 kHz tone generator suits
widely accepted standards
22 kHz tone waveform integrity guaranteed
even at no load condition
Low drop post regulator and high efficiency
step-up PWM with integrated power N-MOS
for low power losses
LPM function (low power mode) to reduce
dissipation
Overload and overtemperature internal
protection with I²C diagnostic bits
LNB short-circuit dynamic protection
±4 kV ESD tolerant on output power pins
RoHS compliant
September 2016
The LNBH25LS evaluation board includes an I²C
bus interface and the internal 22 kHz tone
generator which is factory trimmed and can be
controlled by the DSQIN pin (TTL compatible),
allowing immediate DiSEqC™ data encoding.
Thanks to a fully integrated step-up DC-DC
converter, it functions with a single input voltage
supply source ranging from 8 V to 16 V.
DocID029697 Rev 1
For further information contact your local STMicroelectronics sales
office
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Schematic diagram
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STEVAL-LNBH01
Schematic diagram
Figure 1: STEVAL-LNBH01 circuit schematic
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Revision history
Revision history
Table 1: Document revision history
Date
Version
13-Sep-2016
1
Changes
Initial release.
DocID029697 Rev 1
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STEVAL-LNBH01
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